<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	<script type="text/javascript">
		
		var str = 'HouDunRen';
//		var re = str.toUpperCase();
		var re = str.toLowerCase();
		document.write(re);
		
	</script>
	</head>
	<body>
	</body>
</html>
